sell iPhone X for use with another provider
If I sell my old X does the buyer have to use the same service provider?
iPhone X
If I sell my old X does the buyer have to use the same service provider?
iPhone X
if it's sim locked to your carrier then yes
How to unlock your iPhone for use with a different carrier - Apple Support
and also read
What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support
if it's sim locked to your carrier then yes
How to unlock your iPhone for use with a different carrier - Apple Support
and also read
What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support
sell iPhone X for use with another provider